We could prevent waves from spawning until all players click the "close" button on the upgrades window.
A more sophisticated solution would be to have a ready up system where all players must "Press R to Ready Up". If this takes too long then the host can have an additional prompt to "Press R to Force Start".
We could prevent waves from spawning until all players click the "close" button on the upgrades window.
A more sophisticated solution would be to have a ready up system where all players must "Press R to Ready Up". If this takes too long then the host can have an additional prompt to "Press R to Force Start".